Sewing machine



May 14, 1935. A, w BRADBURY ET AL 2,001,298

SEWING MACHINE Filed Feb. 8, 1934 Patented May 14, 1935 SEWING I Albert W; Bradbury, cliftondale, and; Roy E.v

Hood, Lynm. Mass:,. assignors' to. United: Shoe Machinery Gorporation, Paterson, N. J., a corporation-ofl New Jersey Application-February 8, 1934', Serial No. 7105238 G'GIaims-a (01412-45).

The-present invention relates to improvements in: channel forming and work guiding. devices for McKay type shoe sewing machines employing waxed; thread" and comprising astraight hook 'I" needle; a rotary horn arrangedito; extend'within.

and support the shne, and aneedle threading whirl located within the horn.

The object ofthe invention is to provide in a m sewing machine of.- the McKay type, asimplified anddinproved means for cutting, a stitch receiving groove of uniform depth in the work..

With the above and" other objects in view, a feature of the present invention contemplates.

the provision in a McKay type shoe sewing machine having a work supportihghorma straight hook needle;.a presser foot and' a feed point, of

a work channelling. knife'acting in the linev of" feed between the needle and the presser. foot to form a' stitch receiving groove in the side of thework opposite the horn. In the embodiment knife to outlachannelof'uniformidepth, .the work. being, first. compressed. by the. presser. foot and.

subsequently by the shoulders. on the. knife to prevent irregularities; As illustrated, the cutting is accomplished by-means carried by the feed point, so that the extending shoulders act to render more efiective the operation of the feed point in feeding the work by preventing the formation of irregular projections on the surface of the work By the provision of lateral shoulderson the feed point, not only is the feeding movement itself improved, but the channelling knife being attached to the feed point to cut during movement of the feed point towards the work, does not cause any displacement of the work in the line of feed and maintains the surfaces at the sides of the channel substantially smooth and undisturbed.

Other features of the invention consist in certain constructions, arrangements and combinations of parts, the advantages of which will be obvious tothose skilled in the art from the following description.

In the drawing, Figure 1 is a view in front elevation of a portion of a sewing machine embodying the present invention, parts being broken away and shown in section; Figure 2 is a view in front elevation on an enlarged scale of the work engaging portion of the combined feed point and channelling knife embodying the invention; Figure 3 is a view in end elevation of the knife shown in Figure 2; andFigure 4' is'abottom plan vie'w The machine illustrated in the drawingfcdrh? prises-a straight hook needle ill, a "ro'ta'rywork supporting horn l2; a presser foot M, a'frota'ry shuttle Iiifa loop spreader I-8 and other mechanisms forforming a lockstitch seamfif-Tha presser foot is actuated alternately to clamp and release the work',indicated at I9, andthe wprk; is' fed while releasedfrom the presser foot-as is usual in this type of machineyanexample of} which is illustrated-and described in the U patent to Ashworth' No; 1,914,936 granted-l: 20; 1933 z Inthe illustrated machine; as n the'machine; 'fl

of" the Ashw'orthipatent, the work isffedbyfai feed point secured in a carrierl 'indica'ted inYtlie drawing of the present application at ziliwhich is moved towards. and fromthe work to cause the tip of'the'feedpoint'to engage'and' disengage the: workiin the line. offeed' between the needle; and the presser foot. The connections for; en gaging and disengaging the. feedpoint include a;- link 22: and a. bell. crank lever 2'4 connected be tween the Y presser foot actuating mechanisrnarid: the feed point carrier '20 for. limiting the; depth; to which 'the feed'polnt is permitted'to. penetrate the work. The feeding movements of the feed; point'are 'produced'by swinging the carrier 20" between the needle and the presser foot, and are so adjusted that the needle will penetrate the workv at points coinciding with indentations formed by the feed point, so that slight variations in the depth to which the feed point penetrates causes no difiiculty in the finished seam.

According to the present invention the feed point, indicated at 26, of the present machine is formed with a work channelling knife edge 28 acting in the direction of feed directly behind the presser foot so that the presser foot serves to smooth the surface of the work to'a certain extent before the channelling knife forms its groove. To prevent any variation in the depth to which the feed point and channelling knife may penetrate, the point is provided with laterally extending shoulder portions 30 having flat under surfaces to engage and compress the work at either side of the channelling knife 28. The knife 28 is formed with its cutting edge extending horizontally to cut the workduring the downward movement of the feed point, the feeding movement taking place after the shoulders 30 have been seated on the work surface. To insure proper feeding action, a downwardly extending tip 32 may be formed at the forward end of the knife portion 28. The shoulders 30 on the feed point not only cause the knife to form a groove of uniform depth but also act to compact the material operated upon firmly about the tip 32 so that during the feeding movement, a better grip on the work will be maintained. With the arrangement described, the type of machine illustrated in'the Ashworth patent referred to may be equipped with a channelling knife with no additional mechanical changes aside from possibly a slight adjustment to com pensate for the different reaction on thefeed.

point caused by increased resistance against downward movement of the=channelling knife.

claimed is: l l. A sewing machine of the McKay type having, in combination, stitch forming; and work; feeding devices including a straight hook needle,

a rotary work supporting horn, a presser foot for alternately clamping and releasing the work supported by the horn, a feed point acting on.

the side of the work engaged by'the presser foot tofeed the work when released by the presser foot, and a knife operating in the line of feed between the needle and the; presserffoot to form a stitch receiving groove in the work. I

2, A sewing machine, of the McKay type hav ing, in combination, stitchforming and work feeding devices including a straight hook needle,

a rotary work supporting horn, a presser foot' for alternately clamping and releasing the work supported by the horn, a feed point acting on the side of the work engaged by the presser foot. tofeed the work when released by the'presser' foot, a knife operating inCthe line of ,feed to,

feeding devices including. a straight hook needle," a rotarywork supporting horn, a presser foot for alternately clamping and releasing the work, supported by the horn, a feed point actingon the side of the work engaged by the presser. foot to feed the-work when released by the presser feet, a knife operating in theline; of feedbetween the needle and'the presser foot to form a stitch receiving groove in the work, and a lateral extension on the knife for engaging the surface of the work to limit the depth of the groove.

4. A sewing machine of the McKay type having, in combination, stitch forming and work feeding devices including a straight hook needle, a rotary work supporting horn, a presser foot for alternately clamping and; releasing the work, a "feed point movable towards and from 'the side of the work engaged by the presser foot and in .itheline of feed to feed the work when released by the presser foot, a knife connected to the feed point to form a stitch receiving groove in the work as the feed pointmoves towards the work, Having thus described the invention, what is and a lateral extension on the knife for engaging'the surface-of the work to limit the depth of "the groove. 5, A sewing'machine of the McKay type having, in combination, stitch forming and work feeding-devices including a straight hook needle,

a rotary work supportinghorn, a presser foot of the work .engagedby the presser footand inj the line of feedto feed the work. when released,

by the presser, foot, a knife connected to thefeed point toform a stitch receiving fgroovein the,

the work on both sides of the lineof stitching to.

limit the depth of said'groove.

, 6. A sewing machine of the McKay type hav ing,in combination, stitch forming and work feeding devices including a straight hook needle,

a rotary work supporting hor'n, a presser foot. for alternately clampingiand releasing thework supported by the horn, afeed point movable to-I wards and from the side of the work engaged by the presser foot and acting in the lineof feedj between'the needlejandthe presser foot tofeed the work when rela'se'd, a knife cormected to the feed point to form a stitch receiving groove in, the work as the feedipoint moves towards the work and a lateral extension on the knife for, engaging the surface of the work at one sidefof' the groove tolimitfthedepth of the groove.

ALBERT W. .BRA'DBUBY. j f' 

